All-purpose base layers for year-round comfort Soft, warm and breathable. Stays comfy and maintains stable core temperatures in all kinds of conditions. 100% Australian merino. WoolmarkA(R) certified, and Responsible Wool Standard (RWS) Certified. Odour free, day and night. For those adventures where you walk, run, sweat, sleep, wake up and keep going. Fit note: Size runs large- we recommend ordering one size down.